/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */

package org.apache.plc4x.java.opcua.security;

import java.security.GeneralSecurityException;
import java.security.KeyStore;
import java.security.cert.CertificateException;
import java.security.cert.X509Certificate;
import javax.net.ssl.TrustManager;
import javax.net.ssl.TrustManagerFactory;
import javax.net.ssl.X509TrustManager;

public class TrustStoreCertificateVerifier implements CertificateVerifier {

    private X509TrustManager trustManager;

    public TrustStoreCertificateVerifier(KeyStore trustStore) throws GeneralSecurityException {
        TrustManagerFactory trustManagerFactory = TrustManagerFactory.getInstance(TrustManagerFactory.getDefaultAlgorithm());
        trustManagerFactory.init(trustStore);
        TrustManager[] managers = trustManagerFactory.getTrustManagers();
        for (TrustManager manager : managers) {
            if (manager instanceof X509TrustManager) {
                trustManager = (X509TrustManager) manager;
                break;
            }
        }

        if (trustManager == null) {
            throw new IllegalStateException("Could not initialize trust manager, underlying trust provider not found");
        }
    }

    @Override
    public void checkCertificateTrusted(X509Certificate certificate) throws CertificateException {
        trustManager.checkClientTrusted(new X509Certificate[]{ certificate }, "UNKNOWN");
    }

}
